feat(cron): Add clear-error CLI command

Part of #349. Adds `hermes cron clear-error JOB_ID` command.

hermes_cli/cron.py

@@ -222,7 +222,18 @@ def cron_edit(args):
 
 
 def _job_action(action: str, job_id: str, success_verb: str, now: bool = False) -> int:
-    if action == "run" and now:
+    if action == "clear_error":
+        result = _cron_api(action="clear_error", job_id=job_id)
+        if not result.get("success"):
+            print(color(f"Failed to clear error: {result.get('error', 'unknown error')}", Colors.RED))
+            return 1
+        job = result.get("job", {})
+        name = job.get("name", job_id)
+        print(color(f"Cleared stale error state for job '{name}'", Colors.GREEN))
+        if job.get("error_cleared_at"):
+            print(f"  Cleared at: {job['error_cleared_at']}")
+        return 0
+if action == "run" and now:
         # Synchronous execution — run job immediately and show result
         result = _cron_api(action="run_now", job_id=job_id)
         if not result.get("success"):
@@ -292,9 +303,13 @@ def cron_command(args):
         now = getattr(args, 'now', False)
         return _job_action("run", args.job_id, "Triggered", now=now)
 
+    
+    if subcmd == "clear-error":
+        return _job_action("clear_error", args.job_id, "Cleared")
+    
     if subcmd in {"remove", "rm", "delete"}:
         return _job_action("remove", args.job_id, "Removed")
 
     print(f"Unknown cron command: {subcmd}")
-    print("Usage: hermes cron [list|create|edit|pause|resume|run|remove|status|tick]")
+    print("Usage: hermes cron [list|create|edit|pause|resume|run|remove|clear-error|status|tick]")
     sys.exit(1)